1. The problem statement, all variables and given/known data I am currently doing an investigation into the reaction between different acids and magnesium metal. I want to try and show that by using a large volume of acid the concentration drop as the reaction progresses is significantly reduced. Is there any way of doing this? 2. Relevant equations Mg (s) + 2 HCl (aq) --> H2 (g) + MgCl2 (aq) Mg (s) + 2 H+ (aq) --> H2 (g) + Mg+2 (aq) 3. The attempt at a solution Well I thought that by working out the moles of H+ ions present at the beginning of the reaction and at the end of the reaction may help. Other than that, I would just like to be pointed in the right direction.